.el-flex {
    display: flex;
    align-items: center;
}
.el-flex-1 {
    flex: 1;
}
.el-flex-wrap {
	flex-wrap: wrap;
}

.el-flex-nowrap {
	flex-wrap: nowrap;
}

.el-col-center {
	align-items: center;
}

.el-col-top {
	align-items: flex-start;
}

.el-col-bottom {
	align-items: flex-end;
}

.el-row-center {
	justify-content: center;
}

.el-row-left {
	justify-content: flex-start;
}

.el-row-right {
	justify-content: flex-end;
}

.el-row-between {
	justify-content: space-between;
}

.el-row-around {
	justify-content: space-around;
}

@for $i from 12 to 40 {
	.el-font-#{$i} {
		font-size: $i + px;
	}
}

@for $i from 200 through 800 {
	.el-font-bold-#{$i} {
		font-weight: $i;
	}
}

@for $i from 0 through 80 {
	// 只要双数和能被5除尽的数
	@if $i % 2 == 0 or $i % 5 == 0 {
		// 得出：u-margin-30或者u-m-30
		.el-margin-#{$i}, .el-m-#{$i} {
			margin: $i + px!important;
		}
		
		// 得出：u-padding-30或者u-p-30
		.el-padding-#{$i}, .el-p-#{$i} {
			padding: $i + px!important;
		}
		
		@each $short, $long in l left, t top, r right, b bottom {
			// 缩写版，结果如： u-m-l-30
			// 定义外边距
			.el-m-#{$short}-#{$i} {
				margin-#{$long}: $i + px!important;
			}
			
			// 定义内边距
			.el-p-#{$short}-#{$i} {
				padding-#{$long}: $i + px!important;
			}
			
			// 完整版，结果如：u-margin-left-30
			// 定义外边距
			.el-margin-#{$long}-#{$i} {
				margin-#{$long}: $i + px!important;
			}
			
			// 定义内边距
			.el-padding-#{$long}-#{$i} {
				padding-#{$long}: $i + px!important;
			}
		}
	}
}